Shoe for truing up car-wheels.



N0. 679,78l. Patented Aug. 6, I90l. M. POWER.

SHOE FDR TRUINE UP GAR WHEELS.

(Application filed Oct. 13, 1900.)

(No Model.)

nztness es Y Inventor.

UNITED STATES PATENT OFFICE.

MICHAEL POWER, OF TORONTO, CANADA.

SHOE FOR TRUING UP CAR-WHEELS.

SPECIFICATION forming part Of Letters Patent No. 679,781, dated August 6, 1901.

Application filed October 13, 1900. Serial No. 33,010. (No model.)

To all whom it may concern:

Be it known that I, MICHAEL POWER, master car-builder, of the city of Toronto, in the county of York, in the Province of Ontario,

Canada, have invented certain new and useful Improvements in Shoes for Truing Up Oar-Wheels, of which the following is a specification.

My invention relates to improvements in shoes for truing up car-wheels; and the object of the invention is to devise a shoe adapted for temporary use as brake-shoes on carwheels, whereby such wheels when they have become flat may be trued up accurately in a sentially, of a shoe provided with a series of teeth having chilled cutting edges, the cen= tral portion of such teeth being provided with a composite roughening material in the center and an adhesive-acting material on each side, which material is flowed or otherwise fitted intorecesses in the teeth, the parts being arranged and constructed in detail as hereinafter more particularly explained.

Figure 1 is a perspective View of my improved truing-shoe. Fig. 2 is a cross-section of one of the teeth. Fig. 3 is a longitudinal section through the tooth and shoe.

In the drawings like letters of reference indicate corresponding parts in each figure.

A is the body of the shoe, which is madein the usual arch form at the inside and is provided with an inner flange a, which has a longitudinal recess a made in it in order to mini-' mize the friction on the wheel during the operation of grinding, and a longitudinal groove a of arc-shaped form, which straddles the flange of the wheel.

A represents a series of teeth which are provided with cutting edges 01, a which are inclined or have a sheer to them, as shown. It will also be seen that the outer edge of the teeth are rounded as well as the base of the teeth, and it will thus be understood that the most approved cutting edge is thereby formed, as it is well understood that a straight cutting edge extending straight across the surface to be cut does not act with the same precision as an inclined cutting edge such as described. It will also be noticed that the cutting edge extends close to the edge of the groove a As there is a minimum amount minimum period of time; and it consists, cs

of friction on the flange of the wheel, it will be seen that the great cutting action is performed by the cutting edges of the teeth, which extend close to the groovea as hereinbefore premised. All the cutting edges a are chilled, so as to harden them in order that they may keep their edge.

It is preferable in acting upon the smooth surface of the wheel, which may be flat or out of true, that such surface should be roughened to some extent, and in order to insure this I provide recesses A between the cutting edges of each tooth, into the center of which I fit or flow a block a of material suitable for roughening. I preferably use a composition of emery corundum, Portland cement, and fishglue, in equal parts. To each side of this block a I flow in a strip a of Babbitt metal or lead, which has a tendency of causing the shoe to adhere to the surface of the wheel,and thereby allow of the roughening composition to act upon the wheel and also keep the surface clear of mud, and thereby permit the cutting edges to act with the greatest facility.

By such a device as I describe I find in practice that the wheel is trued up in but a short space of time, whereupon, of course, the truing-shoes may be removed and the ordinary brake-shoes applied again.

What I claim as my invention is- 1. A truing-shoe for car-wheels comprising an arc-shaped body and a series of laterallyextending teeth, said teeth being separated from one anotherby laterally open spaces, substantially as described.

2. A truing-shoe for car-wheels comprisin g an arc-shaped body having a groove at the inner side to fit the flange of the wheel and forming a flange at the inner side, a series of laterally-projecting teeth having chilled cutting edges having a sheer or incline outwardly, so that the teeth are narrower at the point than at the base as and for the purpose specified.

3. A truing-shoe for car-wheels comprising an arc-shaped body having a groove at the inner side to fit the flange of the wheel and forming a flange at the inner side and a longitudinal recess in such flange and a series of laterally-projecting teeth having chilled cutting edges as shown and for the purpose specifled.-

4. In a truing-shoe for car-wheels, the combination with the arc-shaped body having a groove at the inner side to fit the flange of the wheel and forming a flange at the inner side, and a series of laterally-projecting teeth having chilled cutting edges and recesses formed in the teeth extending to the arcshaped groove, of a suitable block of roughening material fitting within the recess and extending to the edge of the groove whereby a combined cutting and grinding surface is provided, as and for the purpose specified.

5. In a truing-s'hoe for car-wheels, the combination with the arc-shaped body having a groove at the inner side to fit the flange of thewheel and forming a flange at the inner side,-and a series of laterally-projecting teeth having chilled cutting edges, and recesses formed in the teeth extending to the areshaped groove, of a suitable block of rough- 2o MIGHAEL POWER.

Witnesses:

L. TRIMBLE, B. BOYD. 

